| Lake Werbellin | |
| Location: | Landkreis Barnim, Brandenburg |
| Coords: | 52.9333°N 13.7167°W |
| Lake Type: | Glacial lake |
| Inflow: | Neuer Graben from Grimnitzsee |
| Outflow: | Werbellinkanal to Oder–Havel Canal |
| Pushpin Map: | Brandenburg |
| Basin Countries: | Germany |
| Length: | 9.27km (05.76miles) |
| Width: | 1.2km (00.7miles) |
| Area: | 7.82km2 |
| Depth: | 22.1m (72.5feet) |
| Max-Depth: | 51m (167feet) |
| Volume: | 0.173km3 |
| Elevation: | 64m (210feet) |
Lake Werbellin (German Werbellinsee) is a lake in the Barnim district of Brandenburg, Germany. It is located south of Joachimsthal in the Schorfheide-Chorin Biosphere Reserve. The southern shore belongs to the Schorfheide municipality. With a surface area of 7.82km2 it is the fourth largest lake in Brandenburg and with 51m (167feet) the second deepest (after Lake Stechlin).
Werbellinsee became famous for the Hubertusstock hunting lodge on its western shore, originally built in 1849, later the resort of East German leader Erich Honecker, where he received several official guests, among them West German Chancellor Helmut Schmidt in December 1981. The eastern shore near the village of Altenhof was the site of a large Young Pioneer camp (Pionierrepublik Wilhelm Pieck).
Today the lake is a popular destination for yachtsmen and the site of several sailing regattas. It is navigable and connected with the Oder river and the Baltic Sea. The northern shore offers winding roads with few traffic disruptions, making it a popular spot for motorcycle riding.